以下内容对我很有用

def generate_random_password(min_length, max_length)
    length = SecureRandom.random_number(max_length - min_length) + min_length
    character_sets = [ 
      ('a'..'z').to_a,
      ('A'..'Z').to_a,
      ('0'..'9').to_a,
      "~!@^&*()_-+=[]|:;<,>.?".split('')
    ]   
    retval = []
    #   
    # Add one character from each set
    #   
    character_sets.each do |character_set|
      character = character_set[SecureRandom.random_number(character_set.count)]
      retval.push character
    end 
    #   
    # Fill the rest of the password with a random character from a random set
    #   
    i = character_sets.count - 1 
    while i < length
      character_set = character_sets[SecureRandom.random_number(character_sets.count)]
      character = character_set[SecureRandom.random_number(character_set.count)]
      retval.push character
      i += 1
    end
    retval.shuffle.join
  end

我喜欢使用的另一种方法：

 rand(2**256).to_s(36)[0..7]

如果您真的对正确的字符串长度有疑问，请添加ljust：

 rand(2**256).to_s(36).ljust(8,'a')[0..7]

(0...8).map { (65 + rand(26)).chr }.join

我花了太多时间打高尔夫球。

(0...50).map { ('a'..'z').to_a[rand(26)] }.join

最后一个更令人困惑，但更灵活，浪费更少的周期：

o = [('a'..'z'), ('A'..'Z')].map(&:to_a).flatten
string = (0...50).map { o[rand(o.length)] }.join

如果要生成一些随机文本，请使用以下方法：

50.times.map { (0...(rand(10))).map { ('a'..'z').to_a[rand(26)] }.join }.join(" ")

该代码生成50个单词长度小于10个字符的随机单词串，然后用空格连接

对于devicesecure_validable，您可以使用

(0...8).map { ([65, 97].sample + rand(26)).chr }.push(rand(99)).join

我想，到目前为止，我最喜欢雷达的回答。我会这样做：

CHARS = ('a'..'z').to_a + ('A'..'Z').to_a
def rand_string(length=8)
  s=''
  length.times{ s << CHARS[rand(CHARS.length)] }
  s
end

require 'securerandom'
SecureRandom.urlsafe_base64(9)